Stack-use-after-return in template_sanity_check in opensc
Summary
OSV-2022-268: Stack-use-after-return in template_sanity_check. Affects opensc versions >= bec4f63c5b8308d7fdca842c5c0b62c3491d106a, < 8697a01850d5e02a3099acd5160d0a0ee2d31077. Fixed in 8697a01850d5e02a3099acd5160d0a0ee2d31077. How to fix ↓
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Background
OpenSC is an open-source smart card library that provides a set of cryptographic and security functions for smart card applications. It is widely used in various applications that require smart card authentication and encryption. The vulnerability in the template_sanity_check function of OpenSC allows for a stack-use-after-return, which can lead to potential security breaches and unauthorized access to sensitive information.
Vulnerability Detail
The stack-use-after-return vulnerability in template_sanity_check arises due to improper handling of memory after a function returns. This can result in reading data from the stack that has already been deallocated, leading to unpredictable behavior and potential security risks. In the case of OpenSC, this vulnerability can be exploited to execute arbitrary code or cause a denial-of-service attack. The vulnerability was reported through the OSS-Fuzz project and has been assigned the identifier OSV-2022-268.
How To Fix
Minimum fixed version
8697a01850d5e02a3099acd5160d0a0ee2d31077
This is the first release that contains the fix.
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Workaround
As a temporary workaround, users can disable or restrict access to the affected functionality in OpenSC to mitigate the risk of exploitation. This can be achieved by modifying the configuration or access control settings of the application or system utilizing OpenSC. However, applying the official fix is strongly recommended to ensure complete resolution of the vulnerability.
Conclusion
The stack-use-after-return vulnerability in template_sanity_check of OpenSC can pose significant security risks and should be addressed promptly. Users are advised to update their OpenSC installations to a fixed version or apply the recommended workaround until the fix can be implemented. For further assistance or support in resolving this vulnerability, please contact DevNack.com.
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FAQ
OpenSC is an open-source smart card library that provides cryptographic and security functions for smart card applications.
A stack-use-after-return vulnerability occurs when a program reads data from the stack after it has been deallocated, leading to unpredictable behavior and potential security risks.
This vulnerability in OpenSC can be exploited to execute arbitrary code or cause a denial-of-service attack.
To fix this vulnerability, update the OpenSC package to a version that includes the fix, such as commit 8697a01850d5e02a3099acd5160d0a0ee2d31077 of the OpenSC GitHub repository.
As a temporary workaround, users can disable or restrict access to the affected functionality in OpenSC. However, applying the official fix is strongly recommended.
References
Related vulnerabilities
Recent vulnerabilities recorded for opensc.
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